ZooL.-^VoL. II.1 RISEN— OLIGOCH^TA. 205 



In the specimen sectioned, the sperm-ducts on one side 

 of the body fuse together just in front of the pore. On the 

 other side they open through two distinct pores. The 

 sperm-ducts after leaving the funnels dip directly into the 

 body-wall. The testes and ovaries are attached rather high 

 up, or in line with the sperm-funnels. 



There is no typhlosole. The sacculated intestine seems 

 to begin in XIII. The nephridia consist of minute tufts of 

 tubules irregularly scattered over the body-wall and espec- 

 ially numerous near the septa. Neither nephrostomes nor 

 nephropores could be found. 



SetcB. — The penial setse are narrower than the ordinary 

 setae, slightly curved at the apex, and smooth. The ordi- 

 nary setse are all ventral and not ornamented. They show 

 the following arrangement according to measurement with 

 the micromillimeter : d-c — T^o; c-b^/\o; 3-0=13; ^~^=35- 

 The distance between the ventral set£e is thus considerably 

 less than that between the lateral setee. 



The body-wall is very thick, the arrangement of the 

 muscular layers being like that in Notiodrilus. 



Zapotecia, gen. no v. 



Definition. — Setae paired, eight in each somite. Clitellum short. Gizzards 

 three, in V, VI and VII. Meganephridia. Spermathecae, two pairs in VIII 

 and IX, with imperfect diverticle. No calciferous diverticles of the intestine. 

 Prostates, two pairs, open on somites anterior and posterior to the male pores, 

 which are in XVIII. Penial setae present. Sperm-ducts hidden in the 

 muscles of the body-wall. 



Affinity. — The genus differs from Trigaster in the pos- 

 session of meganephridia instead of plectonephridia. From 

 Dij^locai'dia it differs in having three gizzards instead of 

 two. 



Zapotecia ameca-mecaB, sp. nov. 



Plate XIV, Fig. 180. 



Definition. — Length, 120 mm., width 8 mm. (specimen contracted). 

 Somites 200. Prostomium divides somite I about one-half. First dorsal 

 pore XV/XVI ; first large pore XX/XXI. Clitellum saddle-shaped, in XIII- 

 XIX. Setae all ventral, paired, but not closely so. Penial setae present at the 



